@article{10_4153_CJM_1980_008_5,
     author = {Douwen, E. K. Van and Lutzer, D. J. and Pelant, J. and Reed, G. M.},
     title = {On {Unions} of {Metrizable} {Subspaces}},
     journal = {Canadian journal of mathematics},
     pages = {76--85},
     year = {1980},
     volume = {32},
     number = {1},
     doi = {10.4153/CJM-1980-008-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1980-008-5/}
}